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Lipid dynamics in boar sperm studied by advanced fluorescence imaging techniques

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Abstract

The (re)organization of membrane components is of special importance to prepare mammalian sperm to fertilization. Establishing suitable methods to examine physico-chemical membrane parameters is of high interest. We characterized the behavior of fluorescent (NBD) analogs of sphingomyelin (SM), phosphatidylserine (PS), and cholesterol (Ch) in the acrosomal and postacrosomal macrodomain of boar sperm. Due to their specific transverse membrane distribution, a leaflet-specific investigation of membrane properties is possible. The behavior of lipid analogs in boar sperm was investigated by fluorescence lifetime imaging microscopy (FLIM), fluorescence recovery after photobleaching (FRAP), and fluorescence correlation spectroscopy (FCS). The results were compared with regard to the different temporal and spatial resolution of the methods. For the first time, fluorescence lifetimes of lipid analogs were determined in sperm cell membrane and found to be in a range characteristic for the liquid-disordered phase in artificial lipid membranes. FLIM analyses further indicate a more fluid microenvironment of NBD-Ch and NBD-PS in the postacrosomal compared to the acrosomal region. The concept of a more fluid cytoplasmic leaflet is supported by lower fluorescence lifetime and higher average D values (FCS) for NBD-PS in both head compartments. Whereas FLIM analyses did not indicate coexisting distinct liquid-ordered and -disordered domains in any of the head regions, comparisons between FRAP and FCS measurements suggest the incorporation of NBD-SM as well as NBD-PS in postacrosomal subpopulations with different diffusion velocity. The analog-specific results indicate that the lipid analogs used are suitable to report on the various physicochemical properties of different microenvironments.

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Acknowledgments

This work was supported by the German Research Council (DFG MU1520/2-1) and by the German Ministry of Education and Research (BMBF Number 033 L046). The authors thank Andreas Herrmann and Thomas Korte (Humboldt-University Berlin) for helpful advice and discussion. The authors also appreciate the excellent technical assistance of Anita Retzlaff (Institute for Reproduction of Farm Animals Schönow e.V.) and Jenny Eichhorst (Leibniz Institute for Molecular Pharmacology).

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Correspondence to Filip Schröter or Karin Müller.

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Schröter, F., Jakop, U., Teichmann, A. et al. Lipid dynamics in boar sperm studied by advanced fluorescence imaging techniques. Eur Biophys J 45, 149–163 (2016). https://doi.org/10.1007/s00249-015-1084-z

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  • DOI: https://doi.org/10.1007/s00249-015-1084-z

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